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Sample 1-50
NavDat sample number 4726 · RHYOLITE
Sample
| Sample ID | 1-50 |
|---|
| Rock name | RHYOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | a few plagioclase phenocrysts in an aphanitic groundmass; groundmass is extremely fine and primarily composed of orthoclase and quartz; pyroxenes also present |
|---|
Location
| Latitude | 44.3182 |
|---|
| Longitude | -103.794 |
|---|
| State / province | South Dakota |
|---|
| Volcanic field | Black Hill Tertiary igneous province |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 47 |
|
40 |
55 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| AL2O3 | 20.9551 | | WT% | NAA |
| FE2O3 | 0.9392 | | WT% | NAA |
| MGO | 1.8557 | | WT% | NAA |
| CAO | 1.1402 | | WT% | NAA |
| NA2O | 7.4606 | | WT% | NAA |
| TIO2 | 0.4088 | | WT% | NAA |
| MNO | 0.1285 | | WT% | NAA |
| BA | 602.24 | | PPM | NAA |
| CE | 142.97 | | PPM | NAA |
| CO | 3.4832 | | PPM | NAA |
| CR | 10.287 | | PPM | NAA |
| CS | 6.3328 | | PPM | NAA |
| EU | 2.5336 | | PPM | NAA |
| HF | 9.6841 | | PPM | NAA |
| LA | 53.874 | | PPM | NAA |
| LU | 0.5767 | | PPM | NAA |
| RB | 107.051 | | PPM | NAA |
| SB | 0.4674 | | PPM | NAA |
| SC | 1.6233 | | PPM | NAA |
| SM | 10.5772 | | PPM | NAA |
| TA | 2.3649 | | PPM | NAA |
| TH | 52.7449 | | PPM | NAA |
| V | 52.7654 | | PPM | NAA |
| YB | 3.7996 | | PPM | NAA |
